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wrote...
Posts: 220
3 weeks ago
In an effort to decide if there is an association between the year of a postal increase and the new postal rate for first class mail, the data were gathered from the United States Postal Service. In 1981, the United States Postal Service changed their rates on March 22 and November 1. This information is shown in the table below.


Do you think a linear model is appropriate here? Explain.
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
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wrote...
Posts: 259
3 weeks ago
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Yes, a linear model is appropriate for this problem. A review of the residual plots shows no obvious pattern.
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